Self-opening die head



Patented Feb. 19, 1929.

STA

TES,

ALBERT F. BREITENSTEIN, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE GEO-METRIC TOOL CO., OF NEW HAVEN, CONNECTICUT, .A CORPORATION.

SELF-OIPENING DIE HEAD.

My in self-opening die-heads,

invention relates to an improvement the obgect being to produce asimple, compact7 reliable and durable fixture constructed withparticular reference to being tripped from the outside by an extraneousabutment or from the inside through the medium of the work itself,according to the nature and exigency of the use of the fixture.

lith these ends in view, my invention consists in a self-openingdie-head characterized by having a tripping-sleeve adapted to be trippedby an abutment external to the fixture and also to be internally trippedthrough the medium of the work being threaded and axially movable uponan operating-sleeve carrying parallel Chaser operating-rods, theforwarduends of which have cam-like connection with the respectivechasers for the positive radial movement thereof in chaser-receivingslots formed in the forward end of the die-body.

My invention further consists in a selfopening die-head characterized asabovel and having certain details of construction and combinations ofparts as will be hereinafter described and pointed out in the claims.

In the accompanying drawings:

Fig. 1 is a view in side eleva-tion of a selfopening die-head embodyingmy invention;

Fig. 2 is-a view thereof in front end elevation; j

Fig. 3 is a view thereof in transverse section on the line 3 3 of Fig.1;

Fig. 41 is a view of the die-head in central longitudinal sectionshowing the fixture closed, preparatory to a threading opera-tion;

Fig. 5 is a corresponding view showing the parts of the die-head in thepositions due to them at the conclusion of a threading operation and atthc instant of the disengagement of the locking-pand from tholocking-rod and before the operating-sleeve has been moved rearwardwhich will instantly follow;

Fig. 6 is a corresponding view showing the parts of the die-head in thepositions due to them at the conclusion of the rearward movement of theoperating-sleeve which effects the retraction of the chasers;

Fig. 7 is a. view of the die-head in transverse section on the line 7-7of Fig. 1; v

Fig. 8 is a brolren detail sectional view on the line 8-8 of 2; p

This application med May 1a, 1928.'

Fig. 9 is a corresponding view on the line 9-9 of Fig.v2; and

Fig. 10 is a corresponding view on the line 10-10 of Fig. 2. y

In carrying out my invention as herein shown, I employ a skeletondie-body 15 having an integral tubular shank 16, an operating-sleeve 17having axial movement on the said die-body and shank, and atrippingsleeve .18 having axial movement upon the said operating-sleeve.At its forward end the said die-body is formed with four equidistantradial slots 19 respectively receiving four chasers 2O having theirinner ends ytoothed as at 21 and their outer ends cut away as at 22 toclear the forward end of the operating-sleeve 17, as clearly shown inFig. 8. Each of the said chasers is formed in one of its side walls withan angular slot 23 receiving an angular lug 24: formed at the forwardend ofy a lChaser operating-rod 25 having reciprocating movement in abore 26 in the said body, whereby the Chaser is positively movedradially into its retracted and cutting positions. At their rear endsthe four rods 25 are secured by pins 27 (Fig. 3) to the operating-sleeveby which they are carried.

Helical springs 28 located in bores 29 ertering the rearl end of thedic-body 15k impinge at their rear ends upon the forwardlyfacingshoulder 30 of theoperating-sleeve 17 and exert a constant effort tomove the said sleeve rearward and so effect the positiveretraction ofthe chasers through the rods 25.

To lock the operating-sleeve 17 in its forward position, in which thechasers are held in their cutting positions against the tension of thesprings 28, I employ a loc'lring-pawl 31 hung in a yslot 32 in theoperating-sleeve 17 upon a pin 33 and formed at its outer en d with abevel 34C for co-action with the inclined forward wall of a segmentalnotch 36 in the inner periphery of the trippingsleeve 18. The inner edgeof the inner cud of the said pawl 31 is cut away for clearance as at 37and co-actswith a locking-notch 38 in the rear end of a locking-rod 39located in a bore 4:0 in the die-body 15 and held against rotationtherein by a'transverse pin 411, The forward end of they rod 39 is boredand tapped for the receptionv'of anadjusting screw L12 entering thedie-body 15 and the bore 40 thereof from its forward face,y

loo

threaded and coupled with the seid trippingn Sleeve for operating theSeme.

2. A self-opening die-heed having a body, radially-movable Chasersmounted in the forward end thereof7 an operatingeleeve axially movableupon the seid body, means connecting' the Said sleeve with the saidChaser for the positive operation thereof in either direction, alooking-pavzl mounted in the said sleeve, e looking-rod mounted in 'theSeid body in position to be engaged by the said pawl, operating-Springeinterposed between the body end Sleeve and relatively moving the semefor the retraction of the chasers, a trippinU-sleeve adapted to beoperated by an externel abutment and also to operate the seid pawl todisengege the same from the said 0perating-rod to permit the opening ofthe fiX- ture, and internal trippingmeens coupled with the said sleevefor the operation thereof and having zt member Centrally located Withinthe die-head for direct engagement by the Work itself.

In testimony whereof7 I have Signed this specification.

ALBERT F. BREITENSTEIN.

